Question

sabendo que U =Q , determine no caderno O valor de x em cada equação 2×_5-3_4=3×20

Answer 1

Olá!

$\dfrac{2x}{5} - \dfrac{3}{4} = \dfrac{3x}{20} \\\\ \dfrac{3x}{20} - \dfrac{2x}{5} = -\dfrac{3}{4} \\\\ \dfrac{3x}{20} -\dfrac{8x}{20} = -\dfrac{3}{4} \\\\ -\dfrac{5x}{20} = -\dfrac{3}{4} \\\\ -\dfrac{x}{4} = -\dfrac{3}{4} \\\\ 4x = 4 \times 3 \Rightarrow x = \dfrac{12}{4} \\\\ x = 3$